Question

1. what are the main benefits provided by the kelp forest to the organisms who live there?
2. identify two factors that affect the growth and stability of the kelp in kelp forests:
3. explain the concept of \keystone species\ in the kelp forest. who is the keystone species, what does it control, and how.
4. what is the current status of the sea otter population? why are they struggling as a species?

Explanation:

1. Kelp forests provide shelter, hiding places from predators, and a source of food (kelp and associated organisms) for the living organisms. They also create a stable micro - environment.
2. Water temperature affects kelp growth as extreme temperatures can stress or kill the kelp. Nutrient availability, especially nitrogen and phosphorus, is crucial for photosynthesis and overall health. Lack of nutrients can limit growth and stability.
3. A keystone species in a kelp forest is one whose presence has a disproportionately large impact on the ecosystem relative to its abundance. Sea otters are a keystone species. They control sea urchin populations. Sea otters prey on sea urchins. Without sea otters, sea urchin populations can explode and over - graze the kelp, destroying the kelp forest ecosystem.
4. Sea otter populations have faced decline in many areas. They are struggling due to historical over - hunting for their fur, oil spills which contaminate their habitat and food sources, and predation by killer whales.

Answer:

1. Shelter, food source, stable micro - environment.
2. Water temperature, nutrient availability.
3. Sea otters are keystone species. They control sea urchin populations by preying on them.
4. Declined in many areas. Reasons: historical over - hunting, oil spills, predation by killer whales.